| Fairyland | | Ender's sister |
| Third | | Ender's brother |
| Valentine | | The second army Ender was in |
| Six | | Ender broke this boys arm on accident |
| Bernard | | Watched over Graff to make sure he wasn't pushing Ender too hard |
| Giant | | The most important game in Command School |
| Andrew | | The school Ender goes to after graduating Battle School |
| Squirrel | | Main Character of the story |
| Peter | | Ender's personal teacher at Command School |
| Petra | | The school Ender goes to so he can learn to become a commander in the war against the buggers |
| Ansible | | Ender's hometown |
| Bean | | Ender's first real launchy friend |
| Rose de Nose | | A device on the back of little children's necks |
| Launchy | | Peter tortures these for fun |
| Graff | | The place where you go after you beat the giant in the game Ender plays in his spare time at Battle School |
| Shen | | Uniform worn during battles at Battle School |
| Alai | | "Mom" of the launchies |
| Eros | | Petra's Army |
| Greensboro | | The aliens in the book |
| Carn Carby | | Administrator of Command School |
| Major Anderson | | the name of the young, new kids at Battle School |
| Stilson | | Commander of Rabbit Army |
| Pheonix | | Commander of Salamander Army |
| Dragon | | The main obstacle in the game Ender plays in his free time at Battle School |
| Rat | | Peter's fake name that he uses on the net |
| Bonzo Madrid | | A machine that sends messages across the galaxy in the blink of an eye |
| Buggers | | She has the best shot out of any one in the school |
| Simulator | | Ender's real name |
| Admiral Chamrajnagar | | Ender's army |
| Pol Slattery | | Ender's age when he went away to Battle School |
| Battle School | | The planet where Command School is located |
| Salamander | | Commander of Leopard Army |
| Locke | | The first army Ender was in |
| Dap | | Administrator at Battle School |
| Monitor | | Ender's best soldier when he is commander of Dragon |
| Demosthenes | | Valentine's fake name that she uses on the net |
| Command School | | Bernard's launchy friend who later becomes Ender's best friend |
| Mazer Rackham | | The title of children looked down on by society |
| Ender Wiggin | | Then boy Ender killed while he was still on Earth, before he went away to Battle School |
| Flash Suits | | Commander of Rat Army |
